// Copyright 2011 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.android.apps.analytics.easytracking;

import android.content.Context;
import android.util.Log;

/**
 * This class implements the ParameterLoader interface by loading parameters
 * from the Application's resources.
 */
public class ParameterLoaderImpl implements ParameterLoader {

  private final Context ctx;
  
  public ParameterLoaderImpl(Context ctx) {
    if (ctx == null) {
      throw new NullPointerException("Context cannot be null");
    }
    this.ctx = ctx;
  }

  /**
   * Look up the resource id for the given type in the package identified by
   * gaContext. The lookup is done by key instead of id as presence of these
   * parameters are optional.  Some or all may not be present. If gaContext is
   * null, return 0.
   *
   * @param key the key for the string resource we're seeking
   * @param type the type (string, bool or integer)
   * @return resource id of the given string resource, or 0 if not found
   */
  private int getResourceIdForType(String key, String type) {
    if (ctx == null) {
      return 0;
    }
    return ctx.getResources().getIdentifier(key, type, ctx.getPackageName());
  }
  
  @Override
  public String getString(String key) {
    int id = getResourceIdForType(key, "string");
    if (id == 0) {
      return null;
    } else {
      return ctx.getString(id);
    }
  }

  @Override
  public boolean getBoolean(String key) {
    int id = getResourceIdForType(key, "bool");
    if (id == 0) {
      return false;
    } else {
      return "true".equalsIgnoreCase(ctx.getString(id));
    }
  }

  @Override
  public int getInt(String key, int defaultValue) {
    int id = getResourceIdForType(key, "integer");
    if (id == 0) {
      return defaultValue;
    } else {
      try {
        return Integer.parseInt(ctx.getString(id));
      } catch (NumberFormatException e) {
        Log.w(EasyTracker.LOG_TAG, "NumberFormatException parsing " + ctx.getString(id));
        return defaultValue;
      }
    }
  }

}
